CA2980115A1 - Material delivery system - Google Patents
Material delivery system Download PDFInfo
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- CA2980115A1 CA2980115A1 CA2980115A CA2980115A CA2980115A1 CA 2980115 A1 CA2980115 A1 CA 2980115A1 CA 2980115 A CA2980115 A CA 2980115A CA 2980115 A CA2980115 A CA 2980115A CA 2980115 A1 CA2980115 A1 CA 2980115A1
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- Canada
- Prior art keywords
- conduit
- valve
- container
- hopper loader
- delivery system
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
- B65G53/66—Use of indicator or control devices, e.g. for controlling gas pressure, for controlling proportions of material and gas, for indicating or preventing jamming of material
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Air Transport Of Granular Materials (AREA)
- Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
- Control Of Conveyors (AREA)
- Chemical Vapour Deposition (AREA)
- Coating With Molten Metal (AREA)
Abstract
The invention relates to material delivery systems and particularly to pulse controlled material delivery systems. A material delivery system comprising: a material source: a container connected by conduit to the material source; a pulse control valve connected to the conduit between the material source and the container for introducing pulses of material into the conduit; a trim valve connected to the conduit between the material source and the container for introducing a continuous flow of gas into the conduit for moving material through the conduit from the material source to the container; a pulse velocity sensor connected to the conduit between the trim valve and the container for measuring the flow of material through the conduit; and a control system connected to the pulse control valve, the trim valve and the pulse velocity sensor to cause material to move through the conduit in relatively dense slugs.
Description
MATERIAL DELIVERY SYSTEM
CROSS-REFERENCE'r0 RELATED APPLICATION
[0001 This application claims the benefit under .3.5 ()S.C. 19.(e) of the earlier filing date. (A' United Statcg.Provisional Patent Application No.. 621135,369 filed on March 19, 2015, the d isclosureof which is incorporated by reference herein.
BACKGROUND
[0002-1 This. apolieition diselose.s an invention which is related, generally and in vµarious embodiments to fluid material delivery SYSMT1S. or dilute phase pneumatic;
material delivery systems conveyed materials through stein piping in dilute phase at high speeds. In the prior dilute phase systems, the material being conveyed is mixed \vith the fluid used to deliver the material thus diluting the concentration of material in the. piping of the system. In dilute phase systems, generally the solid to fluid_ raft) May be up to about 6..
Because the material in tic piping is dilumi, the Velocity of the material in the piping must be inelvased to attain the required volume a material to be delivered. In these prior systems the high speeds necessary 1.-0 convey sufficient quantities of materials in the time allotted caused the material being conveyed to degrade. Degradation of the material being conveyed also generated dust and. streamers that tended to clog the systems. The speed of the material being conveyed also caused wear and deterioration on the piping of the systems.
Also, because the illatefial being conveyed is diluted with the system fluid, measuring the amount of :material being conveyed is difficult.
-BRIEF DESCRIPTION OF THE DRAWINGS
[00031 FIG. 1 shows various components of one .em bo d im. en t of the -material del ivory system.
DET/ULED DESCRIPTMN
[NW] it k to be understood that at least some of the descriptions and the figure of the invention have bCal simplified to illustrate eletnents that are relevant for a clear undeivanding of the invention, µvhile eliminating, ibr purposes of clarity, other elements that those of ordinary skill ìrt the art svill appreciate may also comprise a portion of the invention.
However, because such elements are =e 11 known in the art, and because they do not facilitate a better understanding of the invention, a deseription of such elements is not provided herein.
[0005 J The system described herein conveys inaterial through system piping or conduits in .pulses of relatively dense slugs or pistons of materials. Thus, rather than thoroughly mixing. the system fluid with the material being .e.onveyed, the current system significantly redUces the mixing of the system fluid with the material thereby increasing the density of the material flowing through the system piling. The pulsing of the system creates sings or pistons'. of materlai movinR through the system piping. In this type of system the solid to fluid ratio may be above IA . Because the material slugs are relatively dense, the velocity of the material slugs ovtng through rI'ie. system piping may be reduced while increasing the amount of material being conveyed in the allotted time.
Reducing the speed of material inoving through the piping reduces degradation of the material and reduces degradation of the system piping. Also, since the material slugs ;Ite relatively dense, measurement of the system material throughput is. greatly enhanced.. The system can be operated in either intermittent, and /or .continuous modes, or in both at different times in the conveying :cycle. The .system allows the user the ability to adjust the delivery rate of the material in pounds per hour. higher or lower.. with minimal or TIO changes i.n pump speed andlor frequency changes thus providing greater energy savings. The rate..of material pulse can be varie.d by changing The Pulse valve set.points. This method :enhances the material delivery by increasing the length of the material slugs and increasing the overall density of:
CROSS-REFERENCE'r0 RELATED APPLICATION
[0001 This application claims the benefit under .3.5 ()S.C. 19.(e) of the earlier filing date. (A' United Statcg.Provisional Patent Application No.. 621135,369 filed on March 19, 2015, the d isclosureof which is incorporated by reference herein.
BACKGROUND
[0002-1 This. apolieition diselose.s an invention which is related, generally and in vµarious embodiments to fluid material delivery SYSMT1S. or dilute phase pneumatic;
material delivery systems conveyed materials through stein piping in dilute phase at high speeds. In the prior dilute phase systems, the material being conveyed is mixed \vith the fluid used to deliver the material thus diluting the concentration of material in the. piping of the system. In dilute phase systems, generally the solid to fluid_ raft) May be up to about 6..
Because the material in tic piping is dilumi, the Velocity of the material in the piping must be inelvased to attain the required volume a material to be delivered. In these prior systems the high speeds necessary 1.-0 convey sufficient quantities of materials in the time allotted caused the material being conveyed to degrade. Degradation of the material being conveyed also generated dust and. streamers that tended to clog the systems. The speed of the material being conveyed also caused wear and deterioration on the piping of the systems.
Also, because the illatefial being conveyed is diluted with the system fluid, measuring the amount of :material being conveyed is difficult.
-BRIEF DESCRIPTION OF THE DRAWINGS
[00031 FIG. 1 shows various components of one .em bo d im. en t of the -material del ivory system.
DET/ULED DESCRIPTMN
[NW] it k to be understood that at least some of the descriptions and the figure of the invention have bCal simplified to illustrate eletnents that are relevant for a clear undeivanding of the invention, µvhile eliminating, ibr purposes of clarity, other elements that those of ordinary skill ìrt the art svill appreciate may also comprise a portion of the invention.
However, because such elements are =e 11 known in the art, and because they do not facilitate a better understanding of the invention, a deseription of such elements is not provided herein.
[0005 J The system described herein conveys inaterial through system piping or conduits in .pulses of relatively dense slugs or pistons of materials. Thus, rather than thoroughly mixing. the system fluid with the material being .e.onveyed, the current system significantly redUces the mixing of the system fluid with the material thereby increasing the density of the material flowing through the system piling. The pulsing of the system creates sings or pistons'. of materlai movinR through the system piping. In this type of system the solid to fluid ratio may be above IA . Because the material slugs are relatively dense, the velocity of the material slugs ovtng through rI'ie. system piping may be reduced while increasing the amount of material being conveyed in the allotted time.
Reducing the speed of material inoving through the piping reduces degradation of the material and reduces degradation of the system piping. Also, since the material slugs ;Ite relatively dense, measurement of the system material throughput is. greatly enhanced.. The system can be operated in either intermittent, and /or .continuous modes, or in both at different times in the conveying :cycle. The .system allows the user the ability to adjust the delivery rate of the material in pounds per hour. higher or lower.. with minimal or TIO changes i.n pump speed andlor frequency changes thus providing greater energy savings. The rate..of material pulse can be varie.d by changing The Pulse valve set.points. This method :enhances the material delivery by increasing the length of the material slugs and increasing the overall density of:
- 2 -ti1e material being tonveyed in the system piping, The System can be unplligged \Vith a sclf-tleaning. method by using control logic to open valveS Strategically positioned within the system. The system is able tO convey blended :materials in piping systems across Short or long distances without the issues associated with material separation, -file system may also be operated so that the system will automatically adjust to maintain desired throughput and desired Material velocity.
100(36] Referring to fig, 1., in one embodiment of the invention .system 20 comprises a material source 30 which may be a source of material such as plastic beads, plastic resins, blended resins, powders,. re-grind. waste materials, meal or candy fi-Jr delivery to another point it). system 20. A pump 32. µvhich may be a vacuum pump such as a positive divine...mein claw pump having a 5 horse power motor and capable of develiving up ix) about 25 inches of mercury vacuum pressure in a 2.5 inch line is connected to material source 30 by means of ploing 34. Pump 32 may include a means to control the motor (If pump 32 such as a variable frequency drive mechanism. Pump 32 may operate at about 25 to about 0 .1-1z and between about 1500 to about 3.600 =rptn. Pump 32 creates rì suction in piping 34. so .as to draw material -from material source 30 through piping 34 toward pump 32.
Pump 32 may be connected to a silencer .36 such as a muffler for reducing noise at the output of pump 32.
Pump 32. t7)-)ay also be connected by piping 34 to a. dust collector 38 for removing dust from piping 34.
[00071 An atmospheric valve 40 may be connected by piping 34 between the inlet to pump 32-and the outlet to dust collector 38. Atmospheric valve 40 may be opened to alluw air into piping 34 to re-duce the VaCIEUM pressure in piping .34 without turning off pump 32 and to COM pump 3.2, [00081 A protection It Iter42, such as a odd:4e fitter, may be connected between mom 32 and dust .eolIector 38 by piping. 34 to provide a secondary filter in ease any dust
100(36] Referring to fig, 1., in one embodiment of the invention .system 20 comprises a material source 30 which may be a source of material such as plastic beads, plastic resins, blended resins, powders,. re-grind. waste materials, meal or candy fi-Jr delivery to another point it). system 20. A pump 32. µvhich may be a vacuum pump such as a positive divine...mein claw pump having a 5 horse power motor and capable of develiving up ix) about 25 inches of mercury vacuum pressure in a 2.5 inch line is connected to material source 30 by means of ploing 34. Pump 32 may include a means to control the motor (If pump 32 such as a variable frequency drive mechanism. Pump 32 may operate at about 25 to about 0 .1-1z and between about 1500 to about 3.600 =rptn. Pump 32 creates rì suction in piping 34. so .as to draw material -from material source 30 through piping 34 toward pump 32.
Pump 32 may be connected to a silencer .36 such as a muffler for reducing noise at the output of pump 32.
Pump 32. t7)-)ay also be connected by piping 34 to a. dust collector 38 for removing dust from piping 34.
[00071 An atmospheric valve 40 may be connected by piping 34 between the inlet to pump 32-and the outlet to dust collector 38. Atmospheric valve 40 may be opened to alluw air into piping 34 to re-duce the VaCIEUM pressure in piping .34 without turning off pump 32 and to COM pump 3.2, [00081 A protection It Iter42, such as a odd:4e fitter, may be connected between mom 32 and dust .eolIector 38 by piping. 34 to provide a secondary filter in ease any dust
- 3 -.passes through dust collector 3.8. A pressure sensor 44 .may be connected between protection filter 42 and atmospheric valve 40 by piping 3'4 for monitoring the pressure in piping 34. lf .presSure sensor 44 determines that the pressure in piping 34:exceeds a predetermined itiruitõ
pressure :sensor c1.4 sends isignal to system 20, [00091 A hopper loader 50 may be tonneeted between dust collector 3:8:and material souree 30 blc../ piping 34. Hopper loader 50 collects materiai :conveyed through system 20.
Hopper loader 50 may h.ave a load sensor 52 therein to determ 111Q Svhtzn hopper loader 50 is an empty sensor 53 to determine when hopper loader 50 is empty, Knowing the volume of hopper loader 50 between load sensor 52 and empty sensor 53, the volume ():f material in hopper loader 50 .inay be detertninedõA discharge valve 54 such as a fiap valve, rotary airlock valve or air operated knife gate valve may be connected to hopper loader 50.
When discharge valve 5.4 is opened, material May flOW from hopper loader 50 to a container 56. Timers may also be used to start and stop the tilling of containers 56.
Additi Ofla eontairiers 56 may he connected to discharge valve 54 so that multiple containers 56 may be tilled. in sequence. A loader valve 58 such as an air cylinder plunger style valve may be connected to piping $4 and to the entrance of hopper loader 50 to control the flow of material from piping 34 into hopper loader 50:, [0010] An automatic .fitish valve 60 rimy be. connected to loader va.lve 58 at the inlet of hopper loader 50. Flush valve 60 may be an air cylinder pl kill ger style valve. Flush Valve 60 provides automatic flushing of the seats :of loader valve 5.8 and the seals of automatic -flush valve 60 v.'ith air,. or other system fluid, to maintain those :seals free of material, [001 I A pulse stnsor 64, which may be a proximity sensor, may be connected by piping 34 to the upstream sidt.:" of hopper loader 50 for determining if material is flowing into hopper loader 50.
,õ 4 [00 2) One or more auto clean valves 68,. which may be plunger valves., may be connected in variouS locations to piping 34 for providing a !mans th clean piping 34. If pressure 'sensor 44 determines the pressure in piping 34 exceeds a certain limit, whiei may be due to piping 34 being eloct,:,,ged, the auto elean valve 68 elosest to pump 32 is opened to the atmosphere to allow air into piping 34. The atmospheric air pressure should cause the clog to be removed if the dog is between that auto clean valve 68 and pump 32.. If this does not clear piping 34, the clog in the line may be upstream of that auto clean valve 68, In 'which .ease. -the first auto clean valve is closed and the auto clean valve further upstream is opened to the atmosphere. This sequence colitilltles until material flows in piping.
34.
[00131 A pulse coutrol valve 70 may be connected by piping 34 to material source 30 f4:.V controlling the flow of material through system 20. Pulse control valve 70 may be an air cylinder operated full port valVO. A trim valve 72 such as a one ilia C011trol ball valve_ \vial a servo control may be oonnected to pulse control valve 70 for introducirg atmospheric air into piping 34 a a controlled rate, 'I:rim valve 72 may be open approximately WA.) of capacity during normal operatio.n of system 2.0 which allows a small voltam of atmospheric air to flow continuously in :piping, 34. During operation of system '20, pulse control valve 70 may be fully opened for about 2-4 second intervals which injects a pulse of material into piping 34. Between each sueh pulse, pulse control valve 70 is closed for about ,3 of a second which stops the flow of material in piping- 34. in one embodiment, pulse control valve 70 may be designed such that ..vhen open air is injected and when closed material is injected, Ilaving small continuous flow of air through trim valve ?Si and through piping 34 reduces degradation of piping 34 when the material being conveyed. is abrasive, Howe WI, when appropriate, pulse control valve 70 and trim valve 72 may stop the flow of. ait through system 2.0 betweeri pulses, it desired.. As :an alternative, pulse control valve 70 could be open and the trim valve could be pulsed for 0.1-10 seconds to produce pulses of Material. 'The pulses of material produced by pulse control valve. 70:and trim valve 72 cause slugs. of material to move front inaterial source 30 through piping 34 to hopper loader 5:0. \faring the intensity andior duration of the pulses cart adjust the amount tuld velocity ofmaterial flowing through piping 34. For example, increasing the speed of the motor of pump 32 front about 29 1Iz to about 39 lb. while maintaining trim valve 72 air flow at about 103'S QM quickly increase the material flow rate from aboittIA0 pounds per hour to about 4500 pounds per hour while maintaining the material flow speed through piping 34 .W about 6.34 feet per minute.
Thus,. system 20 is callable of increasing the flow of material through system 20 without increasing the speed of the material thus reducing degradation of the material during the delivery process.
[00141 A pulse velocity .sensor 80 may be :COnneeted between material source .30 and hopper loader 50 by piping 34. Pulse velocity sensor 80 may be used .to monitor the velocity and length of the material slug passing through piping 34. Pulse velocity sensor 80 may include two high speed sensors such as mechanic:al switch, proximity, capacitance or photoelectric sensors to detect the presence and speed of material sings moving through piping $4.. As material flows through pulse...velocity sensor 80, the first sensor detects the beginning of the flow of material and the end of the flow material from w:hich the length of a slug .0/material may be determined, The first senwr may also measure the time between its of inaterialsõA.s, tile material COntirillefzi flowing through pulse.
velocity sensor 80, the second: sensor detects the flow of material, knowing the distance between when the first sensor and second serìsur of pulse v IOC ity .sensor 80 and calculating the time between the first sensor and the second sensor detect material flow, the .speed of material flowing thron0 pulse velocity sensor 80, and thus through 34, can be calculated and controlled.
Knowing the time between slugs of material, the length of a sing of material and the space between slugs of material. system 20 ean calculate -various flow rates and material delivery rates.
- 6¨
0015) A control syste Ell 90 StiQ11 as a programmable logic. control or other louic style control system is connected to the variottscomponents of system 20 for controlling the various components of system 20. For example., data from pulse 'velocity sensor 80 may be communicated to control system 90 so that .control system 90 tnay control pulse control valve 70 and trim valve 72 to control the flow of material through system 20.
110016] In operation,. system 20 and its components are controlled by control system Initial set points we stored in control system 90 and can be modified to match systetn. 20 parameters such as puinp size, line sizes and distances. On startup, pump 32 and valves are off, Hopper loader 50 and pump 32 may remain enabled from the last .operation or they can be enabled by the user, l f hopper loader 50 and pump 32 are both enabled, control system 90 waits .for a signal from empty sensbr 53, which signals that hopper loader 50 needs more material, if load sensor 5.2 signals that hopper loader 50 needs more material, the loading, poocess begins, The atmospheric valve 40 is closed and pump 32 is started 11,' a signal .sent from control system 90 based on the starting f.lz set point (typically 301l).
Pulse control valve 70 begin.5 to pulse on and off based on the starting set point (typically 2 seconds on and .3 seconds off). Trim valve 72 is opened to its starting, set point (typically 1,0'4 The loader valve 58 is opened and material begins to flow from material source 30 through piping 34:
For example, in a normal loading :sequence, lif.',pper loader 50 nay be loaded with a vol (MC
Of CUbiC fbOt and a material density t' 3.5 pounds per cubic foot in about 55 seconds. With nbout a 5 second dump time., the average amount of material delivered through ystem. 20 wt.:gild be about 2,100 pounds per hour, [00171 During loading, the pressure in piping 34 is measured by pressure sensor 44 and the speed of inaterial through piping 34 is measured by pulse velocity sensor 80 signal frOill pressure sensor 44 is transmitted totontrol system 90. If pressure sensor 44 - -determines .1.hat the pressure in piping 34 exceeds a certain limit automatic line clearing is performed as described above.
1001811 During operation of system 20, control systern 90 monitors the performance of the various components of system 20. :Control system 90 can monitor pulse .velocity sensor SO to determine the amount of material moving through system 20. Based on intOrmation trewn pulse velocity sensor 80. control systeol 90 can adjust pulse control valve 70 and trim 'valve 7210 increase the density and/or speed of the material flowing through syStem 20 and into container 56, For example, increasing the amount of time pulse control valve 70 is open svill increase the amount of material io a particular slug of material, Similarly, decreasing the amount of air introduced in piping 34 through triin valve 72 svill increase the density of a particular slug of Material. For example, reducing trim \live 72 from 10% open to 5% open µvill approximately double the density of the- slug of material. Conversely, increasing the amount of air introduced in piping 34 through trim valve 72 will reduce the density of a particular slug of material and increase its speed. Control system 90 ean also control the performance of pump .32 to increase or decrease the pressure in piping 34 and, consequently, adjUst the speed of materiai moving through piping 34. *illus, control system 90 can 'control the speed, density and spacing of slugs of material flowing through piping 34 [00E91 A tinting system may also be used with control system 90 to time delivery of material. Using the timing system, the delivery to container 56 of a. desired quantity of material may be timed. 'Then :control system 90 can be adjusted to deliver the required MialltiN of material in the time allotted,
pressure :sensor c1.4 sends isignal to system 20, [00091 A hopper loader 50 may be tonneeted between dust collector 3:8:and material souree 30 blc../ piping 34. Hopper loader 50 collects materiai :conveyed through system 20.
Hopper loader 50 may h.ave a load sensor 52 therein to determ 111Q Svhtzn hopper loader 50 is an empty sensor 53 to determine when hopper loader 50 is empty, Knowing the volume of hopper loader 50 between load sensor 52 and empty sensor 53, the volume ():f material in hopper loader 50 .inay be detertninedõA discharge valve 54 such as a fiap valve, rotary airlock valve or air operated knife gate valve may be connected to hopper loader 50.
When discharge valve 5.4 is opened, material May flOW from hopper loader 50 to a container 56. Timers may also be used to start and stop the tilling of containers 56.
Additi Ofla eontairiers 56 may he connected to discharge valve 54 so that multiple containers 56 may be tilled. in sequence. A loader valve 58 such as an air cylinder plunger style valve may be connected to piping $4 and to the entrance of hopper loader 50 to control the flow of material from piping 34 into hopper loader 50:, [0010] An automatic .fitish valve 60 rimy be. connected to loader va.lve 58 at the inlet of hopper loader 50. Flush valve 60 may be an air cylinder pl kill ger style valve. Flush Valve 60 provides automatic flushing of the seats :of loader valve 5.8 and the seals of automatic -flush valve 60 v.'ith air,. or other system fluid, to maintain those :seals free of material, [001 I A pulse stnsor 64, which may be a proximity sensor, may be connected by piping 34 to the upstream sidt.:" of hopper loader 50 for determining if material is flowing into hopper loader 50.
,õ 4 [00 2) One or more auto clean valves 68,. which may be plunger valves., may be connected in variouS locations to piping 34 for providing a !mans th clean piping 34. If pressure 'sensor 44 determines the pressure in piping 34 exceeds a certain limit, whiei may be due to piping 34 being eloct,:,,ged, the auto elean valve 68 elosest to pump 32 is opened to the atmosphere to allow air into piping 34. The atmospheric air pressure should cause the clog to be removed if the dog is between that auto clean valve 68 and pump 32.. If this does not clear piping 34, the clog in the line may be upstream of that auto clean valve 68, In 'which .ease. -the first auto clean valve is closed and the auto clean valve further upstream is opened to the atmosphere. This sequence colitilltles until material flows in piping.
34.
[00131 A pulse coutrol valve 70 may be connected by piping 34 to material source 30 f4:.V controlling the flow of material through system 20. Pulse control valve 70 may be an air cylinder operated full port valVO. A trim valve 72 such as a one ilia C011trol ball valve_ \vial a servo control may be oonnected to pulse control valve 70 for introducirg atmospheric air into piping 34 a a controlled rate, 'I:rim valve 72 may be open approximately WA.) of capacity during normal operatio.n of system 2.0 which allows a small voltam of atmospheric air to flow continuously in :piping, 34. During operation of system '20, pulse control valve 70 may be fully opened for about 2-4 second intervals which injects a pulse of material into piping 34. Between each sueh pulse, pulse control valve 70 is closed for about ,3 of a second which stops the flow of material in piping- 34. in one embodiment, pulse control valve 70 may be designed such that ..vhen open air is injected and when closed material is injected, Ilaving small continuous flow of air through trim valve ?Si and through piping 34 reduces degradation of piping 34 when the material being conveyed. is abrasive, Howe WI, when appropriate, pulse control valve 70 and trim valve 72 may stop the flow of. ait through system 2.0 betweeri pulses, it desired.. As :an alternative, pulse control valve 70 could be open and the trim valve could be pulsed for 0.1-10 seconds to produce pulses of Material. 'The pulses of material produced by pulse control valve. 70:and trim valve 72 cause slugs. of material to move front inaterial source 30 through piping 34 to hopper loader 5:0. \faring the intensity andior duration of the pulses cart adjust the amount tuld velocity ofmaterial flowing through piping 34. For example, increasing the speed of the motor of pump 32 front about 29 1Iz to about 39 lb. while maintaining trim valve 72 air flow at about 103'S QM quickly increase the material flow rate from aboittIA0 pounds per hour to about 4500 pounds per hour while maintaining the material flow speed through piping 34 .W about 6.34 feet per minute.
Thus,. system 20 is callable of increasing the flow of material through system 20 without increasing the speed of the material thus reducing degradation of the material during the delivery process.
[00141 A pulse velocity .sensor 80 may be :COnneeted between material source .30 and hopper loader 50 by piping 34. Pulse velocity sensor 80 may be used .to monitor the velocity and length of the material slug passing through piping 34. Pulse velocity sensor 80 may include two high speed sensors such as mechanic:al switch, proximity, capacitance or photoelectric sensors to detect the presence and speed of material sings moving through piping $4.. As material flows through pulse...velocity sensor 80, the first sensor detects the beginning of the flow of material and the end of the flow material from w:hich the length of a slug .0/material may be determined, The first senwr may also measure the time between its of inaterialsõA.s, tile material COntirillefzi flowing through pulse.
velocity sensor 80, the second: sensor detects the flow of material, knowing the distance between when the first sensor and second serìsur of pulse v IOC ity .sensor 80 and calculating the time between the first sensor and the second sensor detect material flow, the .speed of material flowing thron0 pulse velocity sensor 80, and thus through 34, can be calculated and controlled.
Knowing the time between slugs of material, the length of a sing of material and the space between slugs of material. system 20 ean calculate -various flow rates and material delivery rates.
- 6¨
0015) A control syste Ell 90 StiQ11 as a programmable logic. control or other louic style control system is connected to the variottscomponents of system 20 for controlling the various components of system 20. For example., data from pulse 'velocity sensor 80 may be communicated to control system 90 so that .control system 90 tnay control pulse control valve 70 and trim valve 72 to control the flow of material through system 20.
110016] In operation,. system 20 and its components are controlled by control system Initial set points we stored in control system 90 and can be modified to match systetn. 20 parameters such as puinp size, line sizes and distances. On startup, pump 32 and valves are off, Hopper loader 50 and pump 32 may remain enabled from the last .operation or they can be enabled by the user, l f hopper loader 50 and pump 32 are both enabled, control system 90 waits .for a signal from empty sensbr 53, which signals that hopper loader 50 needs more material, if load sensor 5.2 signals that hopper loader 50 needs more material, the loading, poocess begins, The atmospheric valve 40 is closed and pump 32 is started 11,' a signal .sent from control system 90 based on the starting f.lz set point (typically 301l).
Pulse control valve 70 begin.5 to pulse on and off based on the starting set point (typically 2 seconds on and .3 seconds off). Trim valve 72 is opened to its starting, set point (typically 1,0'4 The loader valve 58 is opened and material begins to flow from material source 30 through piping 34:
For example, in a normal loading :sequence, lif.',pper loader 50 nay be loaded with a vol (MC
Of CUbiC fbOt and a material density t' 3.5 pounds per cubic foot in about 55 seconds. With nbout a 5 second dump time., the average amount of material delivered through ystem. 20 wt.:gild be about 2,100 pounds per hour, [00171 During loading, the pressure in piping 34 is measured by pressure sensor 44 and the speed of inaterial through piping 34 is measured by pulse velocity sensor 80 signal frOill pressure sensor 44 is transmitted totontrol system 90. If pressure sensor 44 - -determines .1.hat the pressure in piping 34 exceeds a certain limit automatic line clearing is performed as described above.
1001811 During operation of system 20, control systern 90 monitors the performance of the various components of system 20. :Control system 90 can monitor pulse .velocity sensor SO to determine the amount of material moving through system 20. Based on intOrmation trewn pulse velocity sensor 80. control systeol 90 can adjust pulse control valve 70 and trim 'valve 7210 increase the density and/or speed of the material flowing through syStem 20 and into container 56, For example, increasing the amount of time pulse control valve 70 is open svill increase the amount of material io a particular slug of material, Similarly, decreasing the amount of air introduced in piping 34 through triin valve 72 svill increase the density of a particular slug of Material. For example, reducing trim \live 72 from 10% open to 5% open µvill approximately double the density of the- slug of material. Conversely, increasing the amount of air introduced in piping 34 through trim valve 72 will reduce the density of a particular slug of material and increase its speed. Control system 90 ean also control the performance of pump .32 to increase or decrease the pressure in piping 34 and, consequently, adjUst the speed of materiai moving through piping 34. *illus, control system 90 can 'control the speed, density and spacing of slugs of material flowing through piping 34 [00E91 A tinting system may also be used with control system 90 to time delivery of material. Using the timing system, the delivery to container 56 of a. desired quantity of material may be timed. 'Then :control system 90 can be adjusted to deliver the required MialltiN of material in the time allotted,
Claims (18)
1. A. material delivery system comprising;
a material source;
a container connected by conduit to the material source;
a pulse control valve connected to the conduit between the material source and the container for introducing pulses of material into the conduit;
a trim valve connected to the conduit between the material source and the container for introducing a continuous flow of gas into the conduit for moving material through the conduit from the material source to the container;
a pulse velocity sensor connected to the conduit between the trim valve and the container for measuring the flow of material through the conduit; and a control system connected to the pulse control valve, the trim valve and the pulse velocity sensor to cause material to move through the conduit in relatively dense slugs.
a material source;
a container connected by conduit to the material source;
a pulse control valve connected to the conduit between the material source and the container for introducing pulses of material into the conduit;
a trim valve connected to the conduit between the material source and the container for introducing a continuous flow of gas into the conduit for moving material through the conduit from the material source to the container;
a pulse velocity sensor connected to the conduit between the trim valve and the container for measuring the flow of material through the conduit; and a control system connected to the pulse control valve, the trim valve and the pulse velocity sensor to cause material to move through the conduit in relatively dense slugs.
2. The material delivery system of Claim 1 further comprising;
a hopper loader connected to the conduit between the material source and the container thr receiving material and for selectively loading material into the container;
a load sensor connected to the hopper loader and the control system for determining when the hopper loader is filled;
an empty sensor connected to the hopper loader and the control system for determining when the hopper loader is empty;
a loader valve connected to the hopper loader, the conduit and the control system for selectively loading material into the hopper loader; and a discharge valve connected between the hopper loader and the container and connected to the control system for selectively loading material into the container from the hopper loader.
a hopper loader connected to the conduit between the material source and the container thr receiving material and for selectively loading material into the container;
a load sensor connected to the hopper loader and the control system for determining when the hopper loader is filled;
an empty sensor connected to the hopper loader and the control system for determining when the hopper loader is empty;
a loader valve connected to the hopper loader, the conduit and the control system for selectively loading material into the hopper loader; and a discharge valve connected between the hopper loader and the container and connected to the control system for selectively loading material into the container from the hopper loader.
3. The material delivery system of Claim 2 further comprising a vacuum pump connected by conduit to the downstream side of the hopper loader and connected to the control system for creating a suction in the conduit for causing the material to flow from the material source through the conduit to the hopper loader.
4. The material delivery system of Claim 3 further comprising:
a dust collector connected by conduit between the hopper leader and the vacuum pump for removing dust from the conduit; and an atmospheric valve connected by conduit between the dust collector and the vacuum pump and connected to the control system for allowing atmospheric air into the conduit to reduce vacuum pressure in the conduit and to cool the vacuum pump.
a dust collector connected by conduit between the hopper leader and the vacuum pump for removing dust from the conduit; and an atmospheric valve connected by conduit between the dust collector and the vacuum pump and connected to the control system for allowing atmospheric air into the conduit to reduce vacuum pressure in the conduit and to cool the vacuum pump.
5. The material system delivery system of Claim 4 further comprising:
a filter connected by conduit between the vacuum pump and the dust collector for collecting dust that may pass through the dust collector; and a pressure sensor connected by conduit between the filter and the atmospheric valve and connected to the control system for monitoring the pressure in the system.
a filter connected by conduit between the vacuum pump and the dust collector for collecting dust that may pass through the dust collector; and a pressure sensor connected by conduit between the filter and the atmospheric valve and connected to the control system for monitoring the pressure in the system.
6. The material delivery system of Claim 5 further comprising an automatic flush valve connected to the loader valve and to the control system for maintaining the seals of the loader valve and the seals of the automatic flush valve clean.
7. The material delivery system or Claim 6 further comprising a second pulse velocity sensor connected to the control system and connected to the conduit near the hopper loader thr measuring the amount of material entering, the hopper loader.
8, The material delivery system of Claim 7 further comprising a plurality of automatic clean valves connected w the conduit and to the control system for selectively injecting air into the conduit for cleaning, the conduit.
9. The material delivery system of Claim 8 further comprising a silencer connected to the conduit near the vacuum pump for reducing noise associated with the system.
10. The material delivery system of Claim 9 wherein the vacuum pump is a positive displacement claw pump with a variable frequency drive mechanism.
11. The material delivery system of Claim 10 wherein the material is plastic.
beads.
beads.
12. The material delivery system of Claim 11wherein the gas is air.
13. A method of delivering material through conduits comprising:
providing material to be transferred;
introducing pulses of material into the conduit while also introducing a stream of air into the conduit to produce slugs of material to more through the conduit;
monitoring the velocity of the slugs moving through the conduit;
conducting the slugs through the conduit to a hopper loader; and discharging the material from the hopper loader to a container.
providing material to be transferred;
introducing pulses of material into the conduit while also introducing a stream of air into the conduit to produce slugs of material to more through the conduit;
monitoring the velocity of the slugs moving through the conduit;
conducting the slugs through the conduit to a hopper loader; and discharging the material from the hopper loader to a container.
14, The method of Claim 13 wherein the step of introducing pulses of material includes introducing pulses of material in about 2-4 second pulses and discontinuing the pulses for about 0.3 seconds.
15. The method of Claim 14 further comprising decreasing the flow of the stream of air thereby increasing the density of the slugs moving through the conduit.
16. The method of Claim 15 further comprising activating a vacuum pump for creating a suction in the conduit for moving the material through the conduit,
17. The method of Claim 16 further comprising selectively opening valves in the conduit to selectively inject atmospheric air into the conduit for cleaning the conduit.
18. The method of Claim wherein the step a introducing a stream of air into the conduit includes pulsing the stream of air in about 0.1.-10 second pulses.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201562135369P | 2015-03-19 | 2015-03-19 | |
| US62/135,369 | 2015-03-19 | ||
| PCT/US2016/015314 WO2016148779A1 (en) | 2015-03-19 | 2016-01-28 | Material delivery system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2980115A1 true CA2980115A1 (en) | 2016-09-22 |
Family
ID=56919296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2980115A Abandoned CA2980115A1 (en) | 2015-03-19 | 2016-01-28 | Material delivery system |
Country Status (7)
| Country | Link |
|---|---|
| US (2) | US9745149B2 (en) |
| EP (1) | EP3271272A4 (en) |
| CN (1) | CN107406204A (en) |
| BR (1) | BR112017020023A2 (en) |
| CA (1) | CA2980115A1 (en) |
| MX (1) | MX2017012000A (en) |
| WO (1) | WO2016148779A1 (en) |
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2016
- 2016-01-28 BR BR112017020023A patent/BR112017020023A2/en not_active IP Right Cessation
- 2016-01-28 CA CA2980115A patent/CA2980115A1/en not_active Abandoned
- 2016-01-28 US US15/008,862 patent/US9745149B2/en active Active - Reinstated
- 2016-01-28 CN CN201680016669.7A patent/CN107406204A/en active Pending
- 2016-01-28 MX MX2017012000A patent/MX2017012000A/en unknown
- 2016-01-28 WO PCT/US2016/015314 patent/WO2016148779A1/en active Application Filing
- 2016-01-28 EP EP16765373.2A patent/EP3271272A4/en not_active Withdrawn
-
2017
- 2017-07-24 US US15/657,339 patent/US10093492B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| WO2016148779A1 (en) | 2016-09-22 |
| EP3271272A4 (en) | 2018-12-05 |
| EP3271272A1 (en) | 2018-01-24 |
| US20160272438A1 (en) | 2016-09-22 |
| MX2017012000A (en) | 2018-06-07 |
| CN107406204A (en) | 2017-11-28 |
| US20170320681A1 (en) | 2017-11-09 |
| BR112017020023A2 (en) | 2018-06-12 |
| US10093492B2 (en) | 2018-10-09 |
| US9745149B2 (en) | 2017-08-29 |
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